#include<stdio.h>


int Sum(int start,int end)
{
    int ret = 0;
    for(int i =start;i<=end;i++)
    {
        ret+=i;
    }
    return ret;
}

int main()
{
    printf("process is running\n");

    int start = 1;
    int end = 100;
    int result = Sum(start,end);

    printf("process is done,result:%d\n",result);



    return 0;
}
